Portable power hammer



H. A. FISHER PORTABLE POWER HAMMER Filed March lo. 192i 2 sheets-sheet 1 May-8, 1923.

I 2 Shaets-Sheet 2 A. vFISHER PORTABLE POWER HAMMER Filed March l0 Iv VEA/ro@ gl/aft y BY. y@ rma/fm,

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Patented May 8, 1923.

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HENRY A. FISHER, or CLEVELAND, omo, ASSIGNOE or ONE-HALE 'ro SYDNEY n.

- Y EOXALL, o-E CLEVELAND, omo.

PORTABLE :POWER HAMMER.

Application filed March 10, 1921. Serial No. 451,327.

To all whom t may cof/wem:

Be it known that 1, HENRY A. FISHER, a citizen of the United otates, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Portable Power Hammers, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

This invention relates to a forging apparatus and is primarily concerned with the construction of a power hammer, .wherein the hammer is carried by a pivoted arm and is adapted to be actuated by movement of a foot treadle.

One of the objects of my invention is the construction of a portable forging hammer which possesses sufficient strength and rigid,- ity to enable effective forging work to be accomplished and yet enables the entire structure to be readily transported.

VAnother object is the provision of a light forging hammer whereinthe hammer is' carried by a pivoted arm and adapted to be operated so as to strike the anvil by manipulation of a foot treadle.` In connection with this object my invention contemplates the suspension of the hammer in such manner that the force with which the hammer strikes the anvil may be regulated by the pressure upon the foot treadle;

A further object is the provision of a mechanism for operating the hammer s o as to cause a rebound thereof, when it is brought into contact with the work, to simulate a yhand operation. Furthermore,r my invention contemplates the provision of means for effecting this rebound action of the hammer, without necessitating an upward movement of the operators foot, after a downward motion of the foot treadle is begun. Y

lStill another object is vthe provision of a light yet rigid ,frame which may be constructed of structural shapes1and therefore capable of being cheaply manufactured;

The means for accomplishing the above objects willbe fullv set forth inthe following description which relates to the drawings vand the essential characteristics of my invention will be set forth in the claims..

ln the drawings, Fie. 1 isA a side elevation of 'a portable hammer embodying features of my invention: Fig. 2 is a front elevation thereof; Fig. 3 is a horizontal section taken on the line 3-3 in Fig. 2; liig. 4 is a vertical section taken through the center of the machine and showing one position of the hammer with relation to the anvil.

Designating the parts shown in the dra'w- 60 ings by use of reference characters, 10 represents a base which is preferably a plate mounted on supporting wheels 11, and carrying the front and rear frames 12 and 13, re-

spectively. The rear frame 13 is shown in 65 l4 ig. 2 as comprising a pair Aof upright members 14 and 16, the member 14 being preferably a channel beam bent into an L shape` and secured to the baselO, as by U-bolts 15.

The other upright member 16 is also prefer- 79 ably a channel member that is formed in such manner that one end thereof,` as at 17, is rigidly secured to the lower portion of the frame member 14, and the other end thereof, as at 18, is separated from the member 14 by a spacing plate 19. The intermediate portion of the frame member 16 is 1preferably bent transversely of its axis, as at 20, and is arranged to provide a rigid frame that eliminates the necessity for addi- SQ tional transverse bracing. y

The front frame is positioned on the forward .end of the base A10, and preferably comprises a pair of channel members 21 and 22. These members are shown. as havingthe flanges thereof facing inwardlyand asrigidly secured to the base bythe angle plates 23 and 24, respectively. The upper end of the members 21 and 22 maybe joined by a bed plate or anvil 25 which also serves to 90 support a die block, there being two of such blocks, as at 27, shown in the drawings Any convenient means may be employed for retaining the die blocks in position and I have accordingly shown a set screw'28 which 95 is arranged to engage a shank 26 of each die block, it being understood that a suitable recess is provided in the anvil block to receive said shank portion of the die.r

The front and rear frames being rigidly lective at the option of the operator. A pre- 11o The hammer whichY co-operates 105 ferred form of retaining this hammer. operating mechanism will now be described.

1n Figs. 1 and 2, l have shown a machine as provided `with two sets of hammers, each comprising a head, as at 31 and 32, that may be arranged to receive dies 33 and 34 respectively. The dies may be retained in any convenient manner, such as by a set screw 35, engaging a shank 36. Each head may be provided with a tapered aperture 37 and 3S which is arranged to receive a correspondingly tapered end of an arm 40 and 41. ilfedges and 43% may be tl en employed to maintain the heads in engagement with one end of the arms 40 and -41 respectively, and other wedges 44 and 74 may be utilized for securing the other end of each arm to the shafts 45 and 4G respectively.

To support each hammer-...l prefer to pivot each arm about the Xie of the shafts 45 and 46 in accordance with thc manner as above set forth; The ends of each of these shafts are preferably tapered, as at 47 and 48, and are arranged to be supported by blocks 49 and 50 on the upright members 16 and 14, respectively. A convenient manner of holding these blocks is shown in Fig. wherein bolts 51 and 52 are utilized for clamping the blocks to the plates as at and 54, that are disposed on opposite sides of the upright members.

1n normal position, the hammers are raised above the anvil and are adapted to be retained in such position by means of the springs 55, 56. These springs are shown as having the lower ends thereof connected with the members 57, 58, which project laterally from the shafts 45, 46, respectively; and as having the upper ends thereof secured to the threaded members 59, and GO respectively. To adjust the tension in the springs I provide a set of adjusting nuts 6l, 62, that are arranged to engage the plate 19.

To cause each hammer to strike the anvil, I provide foot treadles 63 and 64, pivotally supported at 65 on a bracket 66 which extends outwardly from the upright member 14, Each ltreadle is operably connected with the shafts 45 and 46, respectively, by arms 67 and 68 and pitmen 69 and 70, respectively.

My invention contemplates the employment of a lost-motion connection between the foot treadles and the hammers. Any convenient lost-motion connection may be employed for this purpose, and, accordingly, I have shown each pitman as comprising` an upper and lower section that are connected intermediate the arms and foot treadles by a turnbuckle 75. The upper end of each turnbuckle may be threaded and rigidly secured to the upper section of each pitman, while the lower end thereof may be provided with an aperture, as at 77, thru which the lower section is free to move. A suitable lock nut 78 may be employed to retain the turnbuclrle in rigid connection with the upsection and a lock nut 79 may be employed on the lower section for limiting the downward movement thereof with relation to the turnbuckle.

The purpose of a lost-motion connection is `to enable the treadle to be forcibly pressed to the ground by the operator and to thereafter enable the hammer to rebound from the work after the blow is struck. It will be understood therefore, that after the rebound, the hammer is retained in raised position above the wor.; by the tension in the springs, while the foot treadle is still held upon the ground. ln the drawings, however, l have shown the hammers in engagement with the work and with the treadle in the lowcrmost position.

1n the drawings the die blocks are shown as arranged for forging a piece of work requiring two ope "ations, but obviously the shape of the block employed may be varied, in accordance with the nature of the work required.

From the foregoing description it will be seen that l have provided a portable forging hammer comprising a light structure which may be cheaply built and is capable of being readily transferred as a unit from place to place while the anvil is so arranged that it is practically supported onI its own base and is well adapted to receive a blow delivered by the hammer.

1 claim:

1. 1n a forging machine, the combination with a base, of a pair of separated frames rigidly connected therewith, one of said frames comprising a pair of upright niembers that are connected together in abutting engagement on one side of the frame, and near one end thereof, said members being separated near the other end of the frame,

a hammer pivotally supported between the separated portions of said members, and a foot treadle connected with the hammer in such manner that a downward movement of the treadle causes a downward movement of the hammer.

2. ln a forging machine, the combination with supporting wheels, of a base mounted thereon, separated frames rigidly secured to the base and carrying a hammer and anvil, respectively, the hammer carrying frame comprising a pair of vertically disposed members, one of said members comprising an L-shaped beam and the other of said members comprising a Z-shaped beam, said Zshaped beam having one leg thereof rigidly secured 'to the vertically disposed portion of the L-shaped member and on one side of the frame.

3. In a forging machine, the combination with a base, of separated frames rigidly se cured thereto and adapted to carrya ham- Vmer and anvil respectively, the anvil carrying frame comprising inwardly disposed channel beams that are connected at the top by the anvil block, and a hammer carrying frame comprising outwardly disposed channel beams that are arranged to be secured back to back along a portion thereof, and on one side of the frame, means comprising a shaft having tapered ends, and blocks having tapered recesses engaging the ends of said shaft for supporting said hammer within the last mentioned frame, and means extending outwardly from the side of the machine for oscillatingsaid hammer by foot pressure.

4. In a forging machine, the combination with a pair of separated frames, a` hammer and anvil supported in said frames, respectively, the hammer being pivotally supported in a plane above the anvil, the supporting means comprising a shaft having a tapered aperture extending therethrough, and having tapered ends thereon, blocks having tapered recesses engaging the ends of said shaft, and means for adjustably securing said blocks to the frame, an arm having tapered ends and in engagement with said tapered aperture, and the hammer, respectively, and yielding means for normally holding said hammer above the anvil.

5. In a forging machine, the combination with supporting wheels, of a base mounted thereon, a pair of separated frames rigidly secured to the base, afhammer and anvil carried by said frames, respectively, the hammer carrying frame comprising members that are in abutting engagement along the longitudinal faces thereof, a shaft extending transversely of said members and pivotally supported therein, an arm connecting the shaft with the hammer, springs having one end thereof connected with the shaft and the other end thereof connected with the top of the frame, a bracket extending outwardly from the side of the frame and adjacent the bottom thereof, a foot treadle pivotally mounted in the bracket, and means connecting the foot treadle with the shaft whereby a downward movement of the treadle causes a downward movement of the hammer.

6. In a forging machine, the combination with a base, a pairv of separated frames connected therewith, one of said frames comprising a pair of upright members that are connected together in abutting engagement along a portion thereof, a hammer pivotally supported by said members, a foot treadle connected with the hammer in such a manner that a downward movement of the treadle causes a downward movement of the hammer, and a lost motion connection intermediate the foot treadle and the hammer.

7 In a forging machine, the combination with a base, of a pair of separated frames carried thereby, a hammer and anvil carried by said frames respectively, the hammer carrying frame comprising members that are in abutting engagement along a portion thereof and along the longitudinal faces thereof, a shaft extending'transversely of said members and pivotally supported therein, an arm connecting the shaft with Athe hammer, springs having one end thereof connected with the shaft and the other end thereof connected with the top of the frame, a member extending outwardly from the side of the frame and adjacent the bottomthereof, a foottreadle pivotally mounted in said enY member, and means comprising a lost motion connection between the foot treadle and the signature.

` HENRY A. FISHER. 

